Typewriter attachment



May 29, 1934. E, L 1,961,028

TYPEWRITER ATTACHMENT Filed April 15. 1932 Fig.5. INVENTOR LOUIS E. YOUELL.

BY HIS ATTORNEYS c am 0M PatenteJM ay 29, 1934 UNITED STATES PATENT OFFICE This invention relates to typewriting machines adapted for making an original-and one or more carbon copies, 6n sheets generally of different widths or lengths, and more particularly to mech- '5 anism for line spacing one of the sheets a different amount from that of the other.

It is the main object of the invention to. provide an automatic device actuated by movement of the typewriter carriage for effecting the desired line spacing. w o I Other "objects and features of novelty will be apparent as the following description proceeds, reference being had to the accompanying drawing, in which form of my invention as embodied in an attachment adapted to be secured to .a conventional p w Figure 2 is a'vertical line 2-'-'2 of'Figure 1; V

Figure 3 is an enlarged detail plan view-of a portion of the structure shown in Figure 1;

Figure 4 is a detail section through a friction brake'for certain of the rollers, and

Figure 5 is a detail of a pressure bearing for one of the pressure rollers.

The invention'is of general application to various kinds of typewriters, and for this reason it has been illustrated in connection with a conventional typewriter, of which the platen 10,-

en under the'sheet 15, and a copy sheet 17 passes aroundthe platen tinder both sheets 15 and 16. In-the form shown, it is desired to line space '40 the copy sheet 17 a greater distance than that of the original sheet 15. For this purpose a roller 19 is provided, and the sheet 17 is passed between this roller 19 and a coacting pressure roller 20.

. The roller 19 is driven by movement of the .45 carriage 12'. For this purpose, the shaft of the roller 19 has keyed thereto a bevel gear 21 which meshes with a bevel gear 22loosely mounted on a shaft 23. Keyed to the shaft 23 is a spur gear 23bymeansofaspring30.

Figure 1 is a front elevation of a preferred section taken along the It should -be noted that in the form shown, the sheet 15 is wider than the sheet 17, so that the margins of the sheet 15 may be engaged by the customary feeding rollers which cooperate with the platen. The sheet 17 however, is relatively narrow, so that it may slide around the platen 10 underneath 'the sheet 15, as it is not wide enough to be caught by the platen pressure rollers.

With this arrangement, the sheet 15, after a 05 line has been typed thereon, the line being reproduced on the sheet 17 by means of the carbon 16, the sheet 15 may be line spaced by the mechanism normally provided on the typewriter for' this purpose, generally during the return movement of the carriage. As the carriage returns, the gear 24 meshing with the rack 25 is rotated, and imparts this rotation to the shaft 23 and the ratchet 28'.

Through the pawl 29 which engages the ratchet 175 28, the bevel gears 21 and 22 are rotated to drive the roller 19 and thus advance the sheet 17 for a distance commensurate with the length of the rack 25 which engaged by the gear 24. Thus by changing the location of the rack 25 laterally, so a the distance through which the sheet 17 is moved s by the return movement of the carriage may be readily? adjusted. I During the forward movement of-the carriagev for the typing operation, the gear 24 again meshes '85 with the rack 25 and rotates the ratchet 28. However, during this forward motion, the ratchet escapes under the pawl 29 without positively engaging the same, so that this motion-of the shaft 23is an idling motion, and no movement is imparted to the gears 21 and 22. r

The rollers 19 and 20. are preferably mounted in an auxiliary frame 32 which may be conveniently supported by a pair of bolts 33 extending upward- 1y from the carriage portion 12, which may be the 'ro1ler.20, and comprises a block 35 mounted in a slot 36 and biased by a spring 37, the compression of which is adjustable by means of a set screw 38. 1

In the form shown the sheet 17 is preferably a continuous web, and a supply roller 40 therefor I is journaled in the frame 32. Afterpassing 24 which meshes with a rack 25 secured to the I50 stationary frameportion 13 of the typewriter.

around the platen 10 and being typed, the sheet 17 passes over a rotatable sleeve 41 on a shaft 42 carried by extensions 43 depending from the auxiliary frame 32. A From this roller 32 the sheet 17 passes between the rollers 19 and 20 as described and passes out over the rear of the attachment frame. r

a ratchet for driving said The carbon sheet 16 is also preferably a continuous web, and a supply roller 45 is provided therefor. Fromthis roller the carbon sheet 16 follows the copy sheet 17 around the roller 42 and between the rollers 19 and 20, but is rewound on a roller 46 journalled in the rear of the attachment frame 32. A sleeve 4'? similar to the sleeve 42 is mounted thereabove, to guide the carbon and copy sheets entering the typewriting machine.

The supply rollers 40 and 45 are each provided with a friction brake such as shown in Figure 4. The shaft 50 has a conical end which enters a thrust block 51 mounted in a bore 52 in the attachment frame 32. A coil spring 53 is mounted in the slot 52 so as to bear against the shoe 51, and the compression of the spring is adjustable by a set screw 54.

The carbon sheet-rewind roller 46 is preferably driven from the shaft of the roller 20 which is driven by engagement with the roller 19. In the form shown, a chain 55 passes over sprockets on the shafts of rollers 20 and 46. As shown in Figure 5, the sprocket 56 is loose on the shaft 5'7, and a collar 58 is adjustably secured on the shaft by a set screw 59. With, this arrangement, the collar may be locked in position to cause the sprocket to.

bear against the hub of the roller 20 with a desired amount of friction. In this manner sufficient slippage is provided to allow for the increasing diameter of the roll of rewound carbon paper on the roller 20. Similar or other suitabledrivin means may be provided for the rollers'40 and 45,

if desired. a I

The invention may be embodied .in various modified forms within the scope of the appended claims.

I claim:

1. In combination with a typewriter having a main frame and a carriage, an attachment frame secured to said carriage, coacting pressure rollers journaled in said attachment frame, a rack secured to said main frame. a gear carried by said attachment frame, a ratchet driven by said gear, and means for driving one of said coacting pressure rollers from said ratchet.

2. In combination with a typewriter having a main frame and carriage, an attachment frame secured to said carriage, coacting pressure rollers journaled in said attachment frame, a rack secured to said main frame, a gear meshing with said rack, bevel gearing for driving one of said coacting pressure rollers, and a ratchet for driving said bevel gearing from said rack engaging gear.

3. In combination with a typewriter having a' gear and meshingwith the other bevel gear, and

second bevel gear from said rack engaging gear.

with said rack engaging 4. In combination with a typewriter having a stationary frame with a carriage slidable thereon and a platen journaled in said carriage, an attachment .frame secured to said carriage, c0- acting pressure rollers and a carbon rewind roller journaled in said attachment frame, a rack on said main frame, means cooperatingwith said rack for driving one of said coacting rollers independently of said platen, and means for driving said carbon rewind roller from the other of said coacting rollers.

5. In combination with a typewriter having a stationary frame with a carriage slidable thereon and a platen journaled in said carriage, an attachment frame secured to said carriage and having journaled therein a web supply roller, a carbon supply roller, coacting pressure rollers for drawing said web and carbon from said supply rollers around said platen, and a carbon rewind roller receiving carbon from said platen, a rack secured to said main frame, means independent of said platen and cooperating with said rack for driving one of said coacting pressure rollers, and means for driving said carbon rewind roller from the other of said coacting pressure rollers. I

6. In combination with a typewriter having a frame, a carriage and-a platen, means independent of said platen for moving a web therearound, cooperating rolling contact means on said carriage and frame actuated by movement of said carriage, and means for driving said web moving means from said rolling contact means comprising rotary drive transmission means between said rolling contact means and said roller, and means for idling said cooperating means during forward movement of said carriage.

'7. In combination with a typewriter having a main frame, and a carriage, an attachment frame secured to said carriage, coacting pressure rollers journaled in said-attachment frame, a rack carried by said main frame, a gear carried by said auxiliary frame and meshing with said rack, and means for driving one of said coacting pressure rollers from said gear comprising a gear rigid with the shaft of said roller, cooperating meansjon said main and auxiliary frames, and a one-way driving connection therefrom to said gear.

8. In combination with a typewriter having a frame, a carriage and a platen, means for moving a'web therearound, cooperating rolling contact meanson said carriage and frame actuated by movement of said carriage, and means for driving said web movingmeans fromsaid rolling contact means upon return movement of said carriage for moving said web relative to the surface of said platen, and including means for preventing drive of said web moving means upon forward movement of said carriage.

LOUIS E. YOUELL. 

